UltraSource Bekina Boots, StepliteX, Size 6, Green Lightweight: Approximately 2.25 lbs. lighter than traditional PVC boots Even Temperature: Polyurethane's air-bubble construction insulates in temperatures down to -4, and the special insole eliminates moisture from your feet Form Fitting: Polyurethane's memory characteristics form to your feet while staying flexible Chemical Resistant: Specially blended polyurethane withstands organic fats, mild chemicals, and industrial greases Longer Lasting: Polyurethane boots last up to three times longer than PVC, minimizing replacement costs and break-in period